I'm still using my 1st Gen iPad to run Time Master. It is about the only app that still works on it! I want to keep using Time Master (great product) and upgrade to the latest iPad or iPhone etc. Does the app work on the latest OSX? I couldn't find Time Master on the Apple App store.

Yes, it runs on the latest iOS. We updated it a few months back to resize it for the iPhone X's larger screen. The current version only runs on iOS 9 or greater. We had to update to the Dropbox V2 API, for Backup & Restore, and that requires iOS 9+. TM probably doesn't show up on your iPad 1 App Store as the current version can no longer be loaded on it (thanks to DB).

So there's no way of running it on earlier versions of iOS? That's a bummer. Understandable, but still a bummer for me at least. lol

As time passes, Apple makes it impossible to "compile" code for the older version of iOS. However the major contributing factor for iOS 9 this time around was Dropbox. They changed their API (Application Programming Interface) and the minimum iOS that it would run on was iOS 9. The killed support for their previous API and it would not run anymore, so we were force to make that the minimum version. We always try to support the oldest iOS versions as we possible can.